数码管显示4X4矩阵键盘按键号

#include<reg51.h> #define uchar unsigned char #define uint unsigned int uchar code display_code[]= { 0x3f,0x06,0x5b,0x4f, 0x66,0x6d,0x7d,0x07, 0x7f,0x6f,0x77,0x7c, 0x39,0x5e,0x79,0x71,0x00 }; void delay_1ms(uchar ms) { uchar i; while(ms--) for(i=0;i<115;i++); } void main() { uchar temp,num=0; P0=0x00; while(1) { P1=0xfe; temp=P1; temp=temp&0xf0; delay_1ms(2); if(temp!=0xf0) { temp=P1; temp=temp&0xf0; delay_1ms(2); if(temp!=0xf0) { temp=P1; //大哥，一定要读端口的值呀，在这里弄了一个晚上 delay_1ms(2); switch(temp) { case 0xee: num=0; break; case 0xde: num=1; break; case 0xbe: num=2; break; case 0x7e: num=3; break; } while(P1==0xee||P1==0xde||P1==0xbe||P1==0x7e);//一定要注意实时性，此处两种方法都能用 /* while(temp!=0xf0) { temp=P1; temp=temp&0xf0; } */ P0=display_code[num]; } } } }